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May 5 is Children's Day in S. Korea. You can see Children's Day for each country in the wiki.

The origin of Children's Day in South Korea is truely special because it is one person's endeavor and devotion.

In 1923, Bang Jeong-Hwan, a social educator, suggested that May 1 should be established as Children's day, and he made it public via campaigns. There was no Children's day before that. In 1946, the Children's day was just moved to May 5. He even invented popularized the word in Korean for "children" (어린이) which did not previously exist is not popular in the Korean language.
(correction : source : Korean language)

He made many stories and songs for kids. He launched campaigns and movements for kids and children rights. He left a will when he die : "A black horse and black carriage is waiting for me in front of my door. I'm leaving children. Please take care of them."

For commemorating his work, Children's Day is a national holiday in South Korea.